Bushing fitting and placement tool



July 11, 1944. J. P. JOHNSON BUSHING FITTING AND PLACEMENT TOOL Filed Aug. 11, 1942 INVENTOR.

ATI'DRN EYs Patented July 11, 1944 UNITED STATES PATENT OFFICE BUSHING FITTING AND PLACEMENT TOOL Jum'us Paul Johnson, New Bern, N. C.

Application August 11, 1942, Serial No. 454,446

3 Claims.

My invention relates to the reconstruction of worn bearings, and has among its objects and advantages the provision of an improved bushing tool particularly suitable for reboring worn bearings in commutator end frames of starting motors.

In many types of starting motors, the armatured shaft is rotatabl journaled in the commutator end frame. The end frame is merely provided with a bore having the proper bearing lit with respect to the shaft. Frequentiy such bearings become worn and cause the armature to drag. To correct such a condition, it is necessary to replace the commutator end frame.

Accordingly, an object of my invention is to provide a tool whereby such a bearing may be rebored by the individual in an expeditiou mam ner to accommodate a bushing to the end that the bearing may be reconditioned without necessitating replacement of the commutator end frame in its entirety.

In the accompanying drawing:

Figure l is a sectional View of my invention with the tool shaft illustrated in elevation;

Figure 2 is a top plan view; and

Figure 3 is a view illustrating the manner in which the tool is utilized to press the bushing into the rebored hearing.

In the embodiment selected for illustration, I make use of a housing it having an annular end face I! of such diameter as to provide a support for the commutator end frame i i. The frame has an annular flange l6 and the annular wall l8 of the housing H3 is of such inside diameter as to receive the flange Hi. In the starting motor, the commutator end frame I 4 is secured to the motor frame through the medium of through bolts which extend through bores in the end wall. To firmly secure the end frame I4 to the housing iii, the latter is provided with studs 22 extending through the bores 26 and provided with nuts 24 for clamping the end frame to the face I2.

The frame it! is provided with a neck 26 having a bore 28 arranged coaxially with the bearing bore 30 in the end frame M, the latter bore rctatably supporting the armature shaft of the starting motor. Fitting snugly but rotatably in the bore 23 is a tool shaft 32 having a cutting tool 34 adjustably secured to the reduced diameter shank 35 of the shaft 32. The tool 34 is supported in an opening 38 arranged at right angles to the axis of the shaft 32 and fixedly secured therein by means of a set-screw 46. The tool 34 is so adjusted as to cut a new bore 42 of a diameter conforming to the diameter of the shaft .32, this diameter corresponding to the outside diameter of the bushing to be pressed into the bore 42. The opposite end of the shaft 32 is provided with a shank 44 having a diameter corresponding to the inside diameter of the bushing. A nut formation 46 is provided at the end of the shank 44.

An internally threaded feed sleeve 48 has threaded connection with the external threads 56 on the neck 26. Upon the shaft 32 is mounted a sleeve 52 having a flange 54 coacting with an internal flange 56 on the sleeve 48 for supporting a thrust bearing 58.

The sleeve 52 fits snugly in the internal flange 56 and is split at 6B and provided with a split ring 62 which may be tightened upon the sleeve 52 through the medium of a bolt 64 for frictionally connecting the sleeve 52 with the sleeve 48. The sleeve 52 is frictionally connected with the sleeve 48 through the medium of a. cork ring 66 pressed between a nut 68 threaded on the sleeve 52 and the internal flange 56.

In operation, the commutator end frame I4 is made secure to the housing It! in the manner of Figure 1. The bolt 64 is then unloosened to permit the shaft 32 to be shifted to bring the cutting tool 34 into engagement with the commutator end frame. The bolt 64 is then tightened and a flange is connected with the nut 46 to impart rotation to the shaft 32. The housing It] is provided with a wing 10 which may be clamped in a vise to support the housing. The shaft 32 is rotated in a clockwise direction until the feed sleeve 48 comes into engagement with the housing 10. The bore 42 will then extend completely through the commutator end frame. The bolt 64 is then unloosened and the bar removed and reversed end to end with the repair bushing 12 placed on the shank 44. The shaft 32 is then pushed back in the neck 26 to bring the bushing 12 into axial alignment with the new bore 42 in the commutator end frame l4. Thus the bushing 12 may be driven home by striking the shank 36 with a soft hammer.

Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

1. A tool for enlarging a bearing bore in a commutator end frame comprising a body having an annular flange and a guide bore, means for securing the commutator end frame to said annular flange with the bearing bore therein in coaxial alignment with said guide bore, a shaft rotatable in said guide bore and having a cutter at one end engageable with the commutator end frame to enlarge the bore therein to a predetermined diameter for the reception of a bearing bushing, a sleeve threadedly connected with said supporting body and having an annular flange, a split sleeve on said shaft having a flange spaced from said annular flange of the first mentioned sleeve, a thrust bearing between the flanges of said sleeves, means for clamping said split sleeve to said shaft, a nut on said split sleeve, a friction member between said nut and said annular flange of the first mentioned sleeve, the other end of said shaft having a shank of a diameter corresponding to the inside diameter of the bearing bushing, said shaft being reversible in said guide bore to feed the bearing bushing mounted on said shank through the guide opening and into the enlarged bore inthe commutator end frame.

2. The invention described in claim 1 wherein said supporting body is provided with a wing to be clamped in a vise, and in which the said other end of the shaft is provided with a nut formation.

3. In a tool of the character described, a body having an abutment surface concentric with a guide bore therethrough, a shaft rotatable in said guide bore and carrying a cutter at one end, a tubular member threadedly connected with said body having an annular flange, a split sleeve on said shaft having a flange spaced axially of the I flang on said tubular member, a bearing between said flanges, means for clamping said split sleeve to the shaft, a nut threaded on said split sleeve,

, and a friction element between said nut and the 

